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Musicians have long inspired films. There’s even a handful of directors who have been moved to tell the story of certain albums on the silver screen. But films about songs? Those are a rarer beast.

I Can Only Imagine, which is released in US cinemas today, is just that: the story behind a song of the same name. But MercyMe’s 2001 ballad isn’t any normal single. Rather, having shifted 2.5 million copies, it’s the best-selling Christian single of all time; a song that inspired so much feeling among those who heard it that it allowed a small-time Christian rock band to transcend into the mainstream off the back of four minutes of music.